Control unit for the handset housing of a mobile radiotelephone set



FIG. 1 is a left side, bottom and rear perspective view of the control unit for the handset of a mobile radiotelephone set showing my new design;

FIG. 2 is a left side, top and front perspective view thereof;

FIG. 3 is a front, top and right side perspective view thereof; and,

FIG. 4 is a rear, top and right side perspective view thereof. 

The ornamental design for a control unit for the handset housing of a mobile radiotelephone set, as shown and described. 